Advice or workarounds to use Nvidia Drivers in Mac OS Mojave
Blender developers have indicated (Dec 2018) two  main obstacles to Blender using GPU on a Macbook:
1) Apple have not been properly supporting OpenCL (in addition to not supporting CUDA).  Consequently Blender had been crashing when attempting to use GPU on MacOS-Mac.  Outside Blender developers' control.
2) Macbook GPUs are not sufficiently powerful - not designed for intense long-duration usage as required for big renders (GPU gets so hot its lifetime may become shortened) - and also they found no overall speed advantage over CPU-only (possibly in part another consequence of poor support by Apple).  In that case, I doubt there is any hope at all in trying to use linux (on same machine) as a workaround.